发明名称 |
Process for the isolation of pyrocatechol and hydroquinone |
摘要 |
A process is described for the isolation of pyrocatechol and hydroquinone from mixtures containing the same, and phenol and higher boiling accompanying substances. The mixture can be one obtained by reacting phenol with a peroxidic hydroxylating agent and removing some of the phenol and the substances which have a lower boiling point than phenol. The mixture is subjected to a first rectification in which phenol and substances which have a boiling point between phenol and pyrocatechol are obtained overhead to leave behind a bottom product containing pyrocatechol and hydroquinone. The bottom product is subjected to a second rectification in which the pyrocatechol is obtained overhead to leave behind a bottom product containing hydroquinone and higher boiling accompanying substances. This bottom product is fed to a concentrating unit in which hydroquinone is evaporated overhead to leave behind high boiling accompanying substances as residue.
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申请公布号 |
US4308112(A) |
申请公布日期 |
1981.12.29 |
申请号 |
US19800166270 |
申请日期 |
1980.07.02 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
JUPE, CHRISTOPH;BAUMERT, JUERGEN;SCHUEMMER, GUENTER |
分类号 |
C07C27/00;C07C37/74;C07C39/08;C07C67/00;(IPC1-7):B01D3/10 |
主分类号 |
C07C27/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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